Final answer:
To find the initial amount of money, use the information provided. Calculate the part of the money spent that was not spent.
Explanation:
To find out how much money the student initially had:
Let x be the total amount of money.
Since three-quarters were spent, the remaining amount is 1/4 of the total, which equals 900 euros.
Hence, x * 1/4 = 900 euros, then solve for x to get the initial amount of money.
To calculate the part of the money spent that was not spent:
Subtract the remaining 900 euros from the initial amount to find the amount spent. Finally, subtract the amount spent from the initial amount to get the part that was not spent.
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